You can report homeless encampments through your mobile device with the MyLA311 app, or by calling 311. (Download the City of Los Angeles MYLA311 App from iTunes or Android/Playstore) They will coordinate with LA County to send outreach services.
You can also go to the LAHSA portal to report an encampment or any homeless person you see: www.lahsa.org/portal/apps/la-hop.
Any dangerous activity or potentially criminal conduct that you personally witness among the homeless population should be immediately reported to:
WLA Transient Unit
Sgt. Anthony Bonner
If you witness illegal activity you can also report to 1-877-ASK-LAPD.
If an emergency, call 911.
Finally, there is a Brentwood Homeless Task Force that is working with all the various agencies to ensure outreach is provided in a safe manner.